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A man dressed as a giant holds a young girl during the giants and big heads parade of the San Fermin festival, on July 10, 2012, in the Northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

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A man dressed as a giant holds a young girl during the...

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A man dressed as a giant holds a young girl during the... Photo-3177238.45752 - SFGate

Image 2 of 25

A young boy wears a mask of a bull at the San Fermin fiesta, in Pamplona northern Spain, Tuesday, July 10, 2012. (AP Photo/Alvaro Barrientos)

Photo: Alvaro Barrientos, Associated Press

A young boy wears a mask of a bull at the San Fermin fiesta, in...

A young boy wears a mask of a bull at the San Fermin fiesta, in... Photo-3177781.45752 - SFGate

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Revelers run in front of a pack of six El Pilar's ranch fighting bulls during the running of the bulls of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012. (AP Photo/Daniel Ochoa de Olza)

Photo: Daniel Ochoa De Olza, Associated Press

Revelers run in front of a pack of six El Pilar's ranch fighting...

Revelers run in front of a pack of six El Pilar's ranch... Photo-3180674.45752 - SFGate

Image 4 of 25

Revelers run in front of a pack of six El Pilar's ranch fighting bulls during the running of the bulls of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012.(AP Photo/Daniel Ochoa de Olza)

Photo: Daniel Ochoa De Olza, Associated Press

Revelers run in front of a pack of six El Pilar's ranch fighting...

Revelers run in front of a pack of six El Pilar's ranch... Photo-3180673.45752 - SFGate

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Revelers run on Estafeta street beside to El Pilar fighting bulls ranch, during the fourth running of the bulls at the San Fermin fiestas, in Pamplona northern Spain, Tuesday, July 10, 2012. (AP Photo/Alvaro Barrientos)

Revelers run on Estafeta street beside to one El Pilar fighting bulls ranch, during the fourth running of the bulls at the San Fermin fiestas, in Pamplona northern Spain, Tuesday, July 10, 2012. (AP Photo/Alvaro Barrientos)

A reveller enjoys a street musicians' performance, on July 10, 2012, in the northern Spanish city of Pamplona, during the San Fermin festival. AFP PHOTO / Rafa RivasRAFA RIVAS/AFP/GettyImages

Photo: Rafa Rivas, AFP/Getty Images

A reveller enjoys a street musicians' performance, on July 10,...

A reveller enjoys a street musicians' performance, on July 10,... Photo-3180669.45752 - SFGate

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A drunk man sleeps in Estafeta street during the San Fermin festival, on July 10, 2012, in the Northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Cleaning workers clean Estafeta street before the fourth run of the bulls of the San Fermin festival, on July 10, 2012, in the Northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

Cleaning workers clean Estafeta street before the fourth run of the...

A man sleeps standing in the street of Estafeta before the fourth run of the bulls of the San Fermin festival, on July 10, 2012, in the northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

A man sleeps standing in the street of Estafeta before the fourth...

A man sleeps standing in the street of Estafeta before the fourth... Photo-3180666.45752 - SFGate

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People wait for the beginning of the fourth run of the bulls of the San Fermin festival, on July 10, 2012, in the northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups. AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

People wait for the beginning of the fourth run of the bulls of the...

People wait for the beginning of the fourth run of the bulls of the... Photo-3180665.45752 - SFGate

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Stone lifter Josetxo Urrutia lifts a stone during a rural Basque sports championship during the San Fermin Festival on July 9, 2012, in the Northern Spanish city of Pamplona. AFP PHOTO / ANDER GILLENEAANDER GILLENEA/AFP/GettyImages

The red Cross workers attend a runner during the fourth run of the bulls of the San Fermin festival, on July 10, 2012, in the northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

The red Cross workers attend a runner during the fourth run of the...

The red Cross workers attend a runner during the fourth run of the... Photo-3180664.45752 - SFGate

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A runner greets a shepherd of Encierro before the fourth run of the bulls of the San Fermin festival, on July 10, 2012, in the Northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

A runner greets a shepherd of Encierro before the fourth run of the...

A runner greets a shepherd of Encierro before the fourth run of the... Photo-3180663.45752 - SFGate

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A runner falls in front of El Pilar bulls during the fourth run of the bulls of the San Fermin festival, on July 10, 2012, in the northern Spanish city of Pamplona. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups . AFP PHOTO/Pedro ARMESTREPEDRO ARMESTRE/AFP/GettyImages

Photo: Pedro Armestre, AFP/Getty Images

A runner falls in front of El Pilar bulls during the fourth run of...

A runner falls in front of El Pilar bulls during the fourth run of... Photo-3180662.45752 - SFGate

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PAMPLONA, SPAIN - JULY 10: Revelers read a paper as they wait before running with El Pilar fighting bulls along la cuesta de Santo Domingo on the fourth day of the San Fermin running-of-the-bulls on July 10, 2012 in Pamplona, Spain. Pamplona's famous Fiesta de San Fermin, which involves the running of the bulls through the historic heart of Pamplona for eight days starting July 7th, was made famous by the 1926 novel of U.S. writer Ernest Hemmingway called 'The Sun Also Rises.' (Photo by Jasper Juinen/Getty Images)

Participants run in front of El Pilar's bulls during the fourth San Fermin Festival bull run, on July 10, 2012, in Pamplona, northern Spain. The festival is a symbol of Spanish culture that attracts thousands of tourists to watch the bull runs despite heavy condemnation from animal rights groups. AFP PHOTO / ANDER GILLENEAANDER GILLENEA/AFP/GettyImages

Photo: Ander Gillenea, AFP/Getty Images

Participants run in front of El Pilar's bulls during the fourth San...

Participants run in front of El Pilar's bulls during the... Photo-3180660.45752 - SFGate

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Revelers run in front of a pack of six El Pilar's ranch fighting bulls during the running of the bulls of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012. (AP Photo/Daniel Ochoa de Olza)

Photo: Daniel Ochoa De Olza, Associated Press

Revelers run in front of a pack of six El Pilar's ranch fighting...

Revelers run in front of a pack of six El Pilar's ranch... Photo-3180659.45752 - SFGate

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Spanish bullfighter David Mora adjusts his 'capote' before a bullfight of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012.(AP Photo/Daniel Ochoa de Olza)

A reveler with a fake bullfighter outfit jumps to the arena after a bullfight of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012.(AP Photo/Daniel Ochoa de Olza)

Photo: Daniel Ochoa De Olza, Associated Press

A reveler with a fake bullfighter outfit jumps to the arena after a...

A reveler with a fake bullfighter outfit jumps to the arena after a... Photo-3180656.45752 - SFGate

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A man wearing a typical Spanish female dress looks on after jumping to the arena at the end of a bullfight of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012.(AP Photo/Daniel Ochoa de Olza)

Photo: Daniel Ochoa De Olza, Associated Press

A man wearing a typical Spanish female dress looks on after jumping...

Revelers dance in the arena after a bullfight of the San Fermin festival, in Pamplona, Spain, Tuesday, July 10, 2012.(AP Photo/Daniel Ochoa de Olza)

Photo: Daniel Ochoa De Olza, Associated Press

Revelers dance in the arena after a bullfight of the San Fermin...

Revelers dance in the arena after a bullfight of the San Fermin... Photo-3180654.45752 - SFGate

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Two couples kiss each other as they wait for the fourth Bull Run of the San Fermin festival, in the Northern Spanish city of Pamplona, on July 10, 2012. AFP PHOTO / Rafa RivasRAFA RIVAS/AFP/GettyImages

Photo: Rafa Rivas, AFP/Getty Images

Two couples kiss each other as they wait for the fourth Bull Run of...

Two couples kiss each other as they wait for the fourth Bull Run of... Photo-3177779.45752 - SFGate